Symptoms and Signs of Mitochondrial Myopathies or Encephalomyopathies

The most common symptoms of these diseases are:

Although these symptoms are very common, in the vast majority of cases they are not due to mitochondrial encephalomyopathies. The reason a medical professional may suspect one of these diseases is the appearance of several of these symptoms simultaneously or additively and at ages when symptoms are rare, for example, the appearance of severe deafness, which is relatively common in older people, but not in a teenager.

The other symptoms are identical to those seen in numerous illnesses that are much more frequent than mitochondrial diseases.